Saw-guide



(No Model.)

- E.' C. MERSHON.

SAW GUIDE. .1\I o.`5(f7,319.Y Patentedlsept. 8, V1896.

; INVENTo/z EDWARD G. MERSHUN Afro/mfr N xs Farias no. Puomuwo. wAs

UNIT-ED STATES g 'PATENT OFFICE.

EDWARD C. MERSHON, OF SAGINAW, MICHIGAN.

SAW-GUIDE.

SPECIFICATION forming part of Letters Patent No. 567,319, dated September 8, 1896. Application flied rebrmy 20,1896. sain No. 579.996. oro model.)

To a/ZZ whom it may corn-cern:

Beit known that I, EDWARD C. MERsHoN,

a citizen of the United States, and a lresident equal expansions of different portions of theof Saginaw, in the county of Saginaw and State of Michigan,have invented a certain new and useful Saw-Guide, of which the following is a specication. K Y

My invention relates to saw-guides, and particularly to those used. in connection with band-saws.

The main obl] ect of the invention is to proi vide guides` for this purpose which will in a great measure prevent the crystallization of the saw-blades, that being one of the chief causes of trouble in the operation of bandsaws. This crystallization is due mainly to portions of the saw-blades comin ginto violent and sudden contact with the guide-pins, either on account of imperfect filing and fitting of the teeth, which tends to make the saw incline toward one side or the other, or to un- `a part of this specification, Figure l represents the upper saw-guide in front elevation. Fig. 2 represents it in side elevation. Figs. 3 and 4 are like representations of the lower guide. Fig. 5 is a transverse section of one member of the lower guide, taken in the plane indicated by the line a: y, Fig. 3. Fig. 6 is a section through the back-thrust wheel.

The guides may be mounted in any satisfactory manner. In this instance, for the purpose of illustration, the upper guide is shownmountedon the rod L, projecting from a plate J, which is fitted to slide vertically on a column arising from the frame of the machine and is adjusted thereon by means of a rod K. Of these parts L is shown in full, but

springs.

only so much of the others is shown as is nec 5o essary to suggest the position and function of rod L. The lower guides are preferably attached directly to the frame of the machine. The upper guide consists of the side plates C, adjustably clamped to rod L by means of screws l-I. Each side plateis provided with a horizontal inclined socket, in which a series of blocks B are clamped by means of the plate N and screw M. These blocks extend oblique'ly downward toward the saw-blade and 6o have their ends beveled to rest evenly against the sides thereof when it is pressed to one side or the other. The blocks B are preferably made of wood, though they may be made of other yielding material, metallic or fibrous, and may be slit or laminated parallel to their upper and lower sides, as shown at b, thereby giving them the effect of stiff layer These slits may, if desired, divide the blocks completely into bundles of strips. 7o These blocks B are so placed asto prevent the saw or the rear edge thereof from wavering laterally, as it is inclined to do, because of the rear edge being a triiie longer than the front edge. Their angle to the'saw and the 75 laminated structure of their lower ends, however, render them sufficiently yielding to allow for the easy passage of uneven parts of the saw, such as are caused by hammering or rolling it for tension and which occur through 8o the middle and along the rear edge of the blade. This-easy passage of uneven parts prevents the crystallization of the blade caused by their striking against the rigid guides commonly used. Guides thus constructed readily yield in the direction of movement of the saw, yet instead of the blocks being of yielding material or construction, as just described, they :may of themselves be unyielding, but so mounted as to 9o swing or slide, as in Fig. 4i, in response tothe pressure of uneven portions of the same blade.

In addition to the blocks B thereare also locatedin the plates C other blocks, as A, which approach the saw perpendicularly andare arranged in a verticalV line close to the teeth to insure proper guidance to the cutting edge of the saw. The portion of the saw to which any lateral movement of the saw-blade will be p corrected by the latter and the saw be presented to the blocks A free from all vibra-v By having several of the blocks A in tion. each series and all removably and adj ustably mounted under the plates G wear may be l readily compensated for and the lower blocks, which wear the most rapidly, can be readily taken out and reiitted.

of some softer or yielding material, such as fiber or asbestos, which is confined between said disks and with which the saw-blade engages. This wheel is journaled in suitable bearings in the lower end of a swinging frame E, which is mounted upon the shaft L and maintained in place thereon preferably by` means of a collar D, which is located between the two parts of the bearing of frame E and clamped to said shaft by a screw H. A spring,

the collar D and a cross-piece of the frame E to hold the wheel iirmly in position and yet 1 to allow it to yield to uneven places in the saw and to have a limited backward movement in response to a sudden thrust upon the The lower gu-ide consists 0f a pair of brackets P, each provided with a hole, as at Q, for

eye U, secured to the bracket P. These.

springs serve to keep the holders in position with their stops against the lower ends of brackets P and yet allow said holders to recede or yield when necessary.

The blocks T, as in the upper guide, are preferably of wood, and, as seen, are upwardly inclined toward the saw, their upper ends being beveled to conform to the direction of the saw-blade, so as to bear evenly thereagainst when the saw is crowded to one side. Said blocks being thus arranged tend to prevent the sawdust 'from accumulating at the guide, as it is apt to do with horizontal guides when sawing green soft woods, and thereby adding friction to the saw, causing it to heat and to crystallize. Each member of the guide, being capable of lateral moven ment, will give in response to any sudden side thrust of the saw, such as is frequently caused by running upon a stone or nail, and allow it to pass freely without kinking or breaking it, as is often the case when sucha thing happens in a machine where horizontal rigid guides lare used. Instead of the holders being arranged to slide obliquely, they may obviously be arranged to slide horizontally or at right angles to the saw, while the guideblocks may be held therein in a position oblique to the saw.

The general construction and combination of parts may be varied from that shown with- L out departing from my invention.

As a guide at the back of the saw, I may, use the back-thrust wheel, which preferably consists of two disks of steel F I41l and a layer What I claim as my invention is l. In a saw-guide, a series of laminated wooden guide-blocks placed side by side, presented obliquely to the saw-blade and mounted to yield laterally when struck thereby, substantially as set forth.

2. A saw-guide consisting of -a series of wooden blocks slitted laterally at their bearing ends and presented obliquely to the saw as and for the purpose set forth.

3. In a saw-guide, laminated blocks presented obliquely to the saw-blade, and beveled'at their ends to conform to the face of as a block of rubber O, is inserted betweenthe saw-blade, as and for the purpose .specilied..

4. In a saw-guide, a series of blocks arranged obliquely to the saw on each side thereof and having their inner ends beveled to fit the saw and slit parallel to their upper sides, for the purpose set forth.

5. The combination with a suitable support, of the side plates C, the transverse series of oblique blocks located therein, and the vertical series of blocks also located in said plates, substantially as and for the purthrust wheel journaled inthe free end of said frame.

8. In a saw-guide, the combination with a supporting-shaft, of plates rigidly secured thereto, oblique guide-blocks mounted in said plates and presented to the back portion ofthe blade of the saw, guide-blocks also mounted in said plates and presented to the saw along the cutting edge and below the level of the oblique blocks, a back-thrust wheel mounted in a frame journaled upon said shaft, and a spring forcing said frame forward.

9. In a saw-guide, the combination with suitable supports, of holders mo untedthereon to yield laterally from the saw, and guideblocks mounted in said holders obliquely to IOO IIO

567,319y ai the. saW, substantially as and for the purpose Signed at Saginaw, in the county of Saginaw set forth. and State of Michigan, this '14th day of Feb- .10. In a saw-guide, the combination With ruary, A. D. 1896. suitable supports, of inclined sliding holders, EDWARD C. MERSHON.

5 blocks secured in said holders and presented Witnesses:

obliquely to the saw, and springs for press- CHARLES E. MERSHON, ing said blocks toward the saw as set forth. JOHN JENNESS. 

